Abstract
By using a graded-index multimode fiber (GI-MMF) with a relatively flat index
profile and high refractive index of the fiber core, a microextrinsic fiber-optic
Fabry?P'erot interferometric (MEFPI) strain sensor is fabricated through chemical
etching and fusion splicing. Higher reflectance of the microcavity is obtained due
to the less-curved inner wall in the center of the fiber core after etching and
higher index contrast between the GI-MMF core and air. The maximum reflection of the
sensor is enhanced 12 dB than that obtained by etching of the Er- or B-doped fibers.
High fringe contrast of 22 dB is obtained. The strain and temperature responses of
the MEFPI sensors are investigated in this experiment. Good linearity and high
sensitivity are achieved, with wavelength-strain and wavelength-temperature
sensitivities of 7.82 pm/\mu \varepsilon and 5.01 pm/?C, respectively.
© 2011 Chinese Optics Letters
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